Table 2.

Indicator Distribution and Correlation Statistics for 2003 National Survey on Drug Use and Health Using an a Priori Base Rate of .40 to Form Provisional Samples (N = 11,441)

				Average correlation
Candidate indicators	Cohen’s d	Skew	Kurtosis	Full sample	Nontaxon	Taxon
Number of days smoked in the past 30 days	1.28	−1.11	−0.49	.381	.236	−.013
Age of first cigarette	0.89	−1.38	11.00	.121	−.090	−.111
Latency to first cigarettea	1.37	0.23	−1.41	.386	.224	.100
Average no. cigarettesa	1.43	−0.11	−0.29	.422	.286	.090
Nicotine Dependence Symptom Scale
Drivea	1.66	0.11	−0.98	.453	.298	.132
Priority	0.59	1.75	3.15	.215	.096	.093
Continuitya	1.55	0.09	−1.12	.425	.277	.093
Stereotypy	0.40	0.29	−0.43	.158	.120	−.025
Tolerancea	1.31	0.63	−0.70	.391	.249	.102

Note. Because these analyses required complete data sets, participants with any missing data were deleted, and the sample size was attenuated here relative to the sample used in the taxometric analyses. Average correlation = mean interindicator correlation for the full sample and the provisional nontaxon and taxon samples.

^aIndicators used in taxometric analyses.